This issue occurs when the length of the wav file exceeds 4 GB. There is a spec for < 4 GB wav files.
We could possibly implement this approach, but then the question becomes, will other applications be able to read the files properly?
We have added the ability to write out monophonic wav files in v1.5.4 b5536, which will keep the size down unless you have a really long program (~ 8 hours or something). Files that would be larger than 4GB will also automatically be written out as separate monophonic wave files…
Does anyone know of other applications that can read or write polyphonic wav files in sizes greater than 4 GB?